3u-21=-21

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Solution for 3u-21=-21 equation: 


Simplifying
3u + -21 = -21

Reorder the terms:
-21 + 3u = -21

Add '21' to each side of the equation.
-21 + 21 + 3u = -21 + 21

Combine like terms: -21 + 21 = 0
0 + 3u = -21 + 21
3u = -21 + 21

Combine like terms: -21 + 21 = 0
3u = 0

Solving
3u = 0

Solving for variable 'u'.

Move all terms containing u to the left, all other terms to the right.

Divide each side by '3'.
u = 0

Simplifying
u = 0

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